(Click for a larger image)
The pocket-sized version of the ever-popular Versalog, this is one nice slide rule. Bearing all of the color-coded. self-documenting scales of its full-size sibling, and the same plastic-laminated bamboo construction, the Post 1461 is one of my favorite rules.
The specimen pictured here is the original pocket Versalog; the later Versalog II added the A scale to the front of the rule and moved the L scale to the back.